Disk bit



Jan. 12 ,1926. 569,280

w. s.- HoLDAwAY DISK BIT Filed April 23, 1924 v I ,1g/VENT?.

ATTO

Patented Jan. 12, 1926.

UNiTED .STATES PATENT OFFICE.

-DISK BIT.

Application led April 23, 1924. SerialkNo. 708,533.

To all whom t may concern:

Be it known that I, WILLIAM S. lIoLDA- WAY, a citizen of the United States, residing in the city of Los Angeles, county of Los Angeles, and State of California, have invented certain Improvements in Disk Bits, of which the following isy a specification.

My invention relates to disk bits of the Y character used in drilling wells, and has as bit and shank in which my invention is em'- its principal objects to' provide a cutting disk in which the cutting edge is divided into segmental portions standing at an an le to the face planes of said disk, said disk eing of integral construction in the preferred form; to provide a disk bit shank having its legs substantially*straight, or parallel with each other at their ,inneror adjacent sides, whereby the inner faces of said legs rwhich carry thecutting disks are in parallel planes; Ito provide an improved bearing means for the cutting disks, whereby to increase the life of the disk and the shank by making possible relatively small replaceable parts interposed between the disk and the shank leg which supports the disk; and in general, to provide an improved disk bit and shank along lines which will increase its eiici'ency in the drilling function and which will increase its life under hard usage In order to explain my invention, I have shown one practical form or embodiment of the same on the accompanying sheet ol drawings, which I will describe in detail. In the drawings,-` l

Figure 1 is a perspective view of a disk bodied; G

Figure 2 is a bottom end view, with one leg and one disk shown in section, to illustrate the means of mounting the disk on the inner face of the leg; and Y Figure'3 is a'fragmentary view of one leg of the shank illustrating the construction and arrangement as to certain details as adopted for explanatory purposes. I

Referring now in detail to the drawings, this particular embodiment of my invention comprises a shank body 1, of any desired type as to its upper end, and at its lower end having two leg portions, 2, 2, on the inner faces of 'which legsl are formedI trunnions, 3, 3, with bolt holes, 4, 4, through said le and trunnions, the outer ends of said ho es being countersunk, as at 4, to receive the bolts 5, 5, substantially in the manner illustrated. A bearing bushing, 6, is protrunnion in each case.

vided for each of said trunnions, 3, 3, said bearing bushings being held from turning on said trunnions by means of lugs, as 3B, formed on the trunnions, as illustrated in Fig. 3. Said bearing bushings are shown of flaring form at their inner ends, to fornr head portions, as 6", and said bolts 5, 5, are inserted from the outer sides of the legs and are screwed into the bearing bushings, substantially in the manner illustrated lin Fig. 2,-with their heads protected in the 'countersunk outer ends of the bolt holes.

Mounted to turn on said bearing bushings, (i, 6, are cutter disks, 7, 7, formed with their cutting edges divided segmentally and each segmental portion standing at an angle to the plane of the inner face of said disk, the segn'iental cutting edges of the bits standing in substantially parallel planes, in the form oi the invention used for illustrative purposes. The central bore of each disk or bit is countersunk in its inner end to receive the head portion 6b of the bearing bushing 6. This leaves the inner faces of the cutter disks smooth and at the same time provides a very simple and efficient holding means for holding the disks in place on their bearing bushings or axles, which stand substantially parallel with the axis of the body of the shank. I l

The legs, 2, 2, are shown curved slightly in the direction of rotation, which results in their being slightly offset relative to each other, as will be understood from Fig. 2.' The bearing bushings are replaceable when worn and this is accomplished with a minimum of work and tools, as it is only required that the bolts be removed from the outside, whereupon the disk and the bearing bushing can be removed inwardly from the New bearing bushings can be placed in the disks and the two inserted` in place on the trunnions and the bolt replaced. The usual water conduit, 1a, is provided in the body of the shank, and said shank :is shown provided at its outer opposite sides with reinforcing weh-like portions, as l, to form a smooth, tapered and strengthened connection between each leg and the body proper of ythe shank.

Thus I have shown and described a preferred form of the invention, and while I am aware that changes can be made in the details of construction and arrangement without departing from th'e heart of the invention, I do not limit the invention to the l n n showing made for illustrative purposes except as I may be limited by the hereto appended claims.

I claim:

1. A disk bit and shank including a shank body with two spaced legs, said legs having integral bearing trunnions on their inner faces, cutter disks rotatably mounted von said trunnions between said legs, whereby said legs push said disks in front of them as they rotate, and means holding said disks on said bearing trunnions.

2. A disk bit and shank including a shank body having two stra-ight legs, with their adjacent faces substantially parallel with each other, integral bearing trunnions on the inner faces thereof, two cutting disks roatably mounted on said trunnions, the cutting edges of said disks being divided into segmental portions standing substantially parallel with each other and at angles to the face of`said disks.

3. A drill bit comprising in combination a shank body having two spaced leg portions whose inner sides are substantially straight and parallel with each other, disk-supporting trunnions formed integral on the adjacent faces of said leg portions, bearing bushings on said trunnions with means for holding them from turning thereon, said bushings having head portions, cutting disks mounted on said bearing bushings between vsaid leg portions and the head portions of said bushings, a bolt through each of said leg portions and screwed into said bearing bushings for holding said bushing and said disk on said trunnion, said cutting disks having their cutting edges divided into segmental portions and at angles -to the planes of the faces of said disks. f

4:. A rotary disk bit of the character shown, comprising in combination, a shank body having two leg portions whose inner sides are straight and substantially parallel with each other, integral supporting trunnions formed on said sides, cutter disks rosaid trunnions between said legs, whereby said legs push said disks in front of them as they rotate, said disks being spaced apa-rt to provide a free passage for detritus therebetween, and means holding said disks on sald bearing trunnions.

6. A disk bit and shank including a shank body with two spaced legs, said legs having' integral bearing trunnions on their inner faces, cutter disks -rotatably mounted on said trunnions between said legs, whereby said legs push said disks in front of/ them as they rotate, said disks being spaced apart, thus providing betweenthe disks a substantially unobstructed passage for detritus cut by the disks, and means holding saidv disks o,n said vbearing trunnions.

Signed at Los Angeles, Los Angeles County, California, this 16th day of April, 1924.

WILLIAM S. HOLDA'WAY. 

